Ductile Cast Iron vs. Grade 21 Titanium
Ductile cast iron belongs to the iron alloys classification, while grade 21 titanium belongs to the titanium alloys. There are 27 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.
For each property being compared, the top bar is ductile cast iron and the bottom bar is grade 21 titanium.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 170 to 180 | |
| 140 |
| Elongation at Break, % | 2.1 to 20 | |
| 9.0 to 17 |
| Poisson's Ratio | 0.28 to 0.31 | |
| 0.32 |
| Shear Modulus, GPa | 64 to 70 | |
| 51 |
| Shear Strength, MPa | 420 to 800 | |
| 550 to 790 |
| Tensile Strength: Ultimate (UTS), MPa | 460 to 920 | |
| 890 to 1340 |
| Tensile Strength: Yield (Proof), MPa | 310 to 670 | |
| 870 to 1170 |
Thermal Properties
| Latent Heat of Fusion, J/g | 270 | |
| 410 |
| Maximum Temperature: Mechanical, °C | 290 | |
| 310 |
| Melting Completion (Liquidus), °C | 1160 | |
| 1740 |
| Melting Onset (Solidus), °C | 1120 | |
| 1690 |
| Specific Heat Capacity, J/kg-K | 490 | |
| 500 |
| Thermal Conductivity, W/m-K | 31 to 36 | |
| 7.5 |
| Thermal Expansion, µm/m-K | 11 | |
| 7.1 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 1.9 | |
| 60 |
| Density, g/cm3 | 7.1 to 7.5 | |
| 5.4 |
| Embodied Carbon, kg CO2/kg material | 1.5 | |
| 32 |
| Embodied Energy, MJ/kg | 21 | |
| 490 |
| Embodied Water, L/kg | 43 | |
| 180 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 17 to 80 | |
| 110 to 180 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 280 to 1330 | |
| 2760 to 5010 |
| Stiffness to Weight: Axial, points | 12 to 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 to 26 | |
| 32 |
| Strength to Weight: Axial, points | 17 to 35 | |
| 46 to 69 |
| Strength to Weight: Bending, points | 18 to 29 | |
| 38 to 50 |
| Thermal Diffusivity, mm2/s | 8.9 to 10 | |
| 2.8 |
| Thermal Shock Resistance, points | 17 to 35 | |
| 66 to 100 |
Alloy Composition
| Aluminum (Al), % | 0 | |
| 2.5 to 3.5 |
| Carbon (C), % | 3.0 to 3.5 | |
| 0 to 0.050 |
| Hydrogen (H), % | 0 | |
| 0 to 0.015 |
| Iron (Fe), % | 93.7 to 95.5 | |
| 0 to 0.4 |
| Molybdenum (Mo), % | 0 | |
| 14 to 16 |
| Niobium (Nb), % | 0 | |
| 2.2 to 3.2 |
| Nitrogen (N), % | 0 | |
| 0 to 0.030 |
| Oxygen (O), % | 0 | |
| 0 to 0.17 |
| Phosphorus (P), % | 0 to 0.080 | |
| 0 |
| Silicon (Si), % | 1.5 to 2.8 | |
| 0.15 to 0.25 |
| Titanium (Ti), % | 0 | |
| 76 to 81.2 |
| Residuals, % | 0 | |
| 0 to 0.4 |